does this block uv rays?
1808
It appears to have a UPH rating of 50, which equates to blocking approximately 97.5% of UV rays. http://babybeachtents.net/genji-sports-pop-up-family-beach-tent-and-sun-shelter-review
707287
No, the fabric is an open weave that allows air and water to pass through, but stops 97% of the UV........
47150
I believe they block 100% of uv rays. I have been wearing this particular style for 20 years.
979155
anything will block a UV ray. even a clear plastic lid will block the rays. I did an experiment in my microbiology lab where we exposed two plates with bacteria to UV light. One plate was covered by a clear plastic lid and the other was not. The bacteria on the exposed plate had no bacteria growth because it was killed by the UV, the plate covered by the clear plastic lid did have growth. The lid provided adequate UV protection even with the plastic being clear. As long as the rays are being interfered with by something, they cannot be absorbed, whether it be clear, opaque or solid.
385373
My thought was yes. UVC is a short wavelength and that is why it is blocked by our atmosphere. So it is easily blocked by glasses and probably plastic as well, especially plastic that we know blocks UVA and UVB rays. Here something from Wikipedia: Ordinary glass is partially transparent to UVA but is opaque to shorter wavelengths, whereas silica or quartz glass, depending on quality, can be transparent even to vacuum UV wavelengths. Ordinary window glass passes about 90% of the light above 350 nm, but blocks over 90% of the light below 300 nm. So with resonable confidence yes they block UVC, which is what germicidal lamps put out. Watch out for your exposed skin though.
794864
Website says blocks UV rays from up to 400 nanometers? Here's the link. http://www.bolle.com/technology/goggle/technology
286995
The ones we had were sufficient for blocking out the sun. And worked as I had hoped. If it is not clinging, be sure you remove the protective film! I took them on and off as needed.
1288896
I don't think so...it is a mesh material, not total sunblock, like a black out curtain.
722646
Yes, it is my understanding that it has everything to do withe the intensity of the light. It is not providing any UVA or UVB rays which might be filtered out by glasses. I wear my glasses while I sit next to my Happy Light and read or work on my computer. So does my mother.
2240766
this umbrella was great to block the sun. we bought a second umbrella at the beach and you could feel the heat coming through it. this one from amazon is great for cover and UV protection. u
588172
I'm sorry to say that I have no idea. I have many pairs of glasses and all offer protection from UV rays.
607899
You can see through it - It will block the sun like shade it but not completely.
874342
I believe it is protection from the harmful rays of the sun (ultraviolet A and B). I found this to be a very nice umbrella, by the way, and great on vacation.
979154
The answer, Lela, is, you can not be sure. The company did not bother to provide any information as to why/how the gloves block UV. The material is not listed (unless it is listed on the packaging) but even so, you would have to know which materials are known to block UV and then you would have to look at the how tightly the weave was...a lot of work for a customer. There is no percentage given, another red flag. Why wouldn't there be a percentage? Imagine buying a sunscreen which simply says "Blocks UV"...
255415
It defuses the sun light. No squinting. Suppose to help with uv. You do not feel direct sun het. I like the product. Not easy to install.
295178
Cathie, I don't think this is what you'd want to block out sunlight. This piece is very small, less than two inches, and I removed it again after only a couple of shots (not wearing glasses.) It does move the camera away from your face but would not block out sunlight.
131128
Yes it's broad spectrum (protects against UVA & UVB rays). It notes protection against both in the product description as well.